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Diffstat (limited to 'arch/sh/include/asm/switch_to_32.h')
-rw-r--r--arch/sh/include/asm/switch_to_32.h131
1 files changed, 131 insertions, 0 deletions
diff --git a/arch/sh/include/asm/switch_to_32.h b/arch/sh/include/asm/switch_to_32.h
new file mode 100644
index 000000000..9c93fb91a
--- /dev/null
+++ b/arch/sh/include/asm/switch_to_32.h
@@ -0,0 +1,131 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_SH_SWITCH_TO_32_H
+#define __ASM_SH_SWITCH_TO_32_H
+
+#ifdef CONFIG_SH_DSP
+
+#define is_dsp_enabled(tsk) \
+ (!!(tsk->thread.dsp_status.status & SR_DSP))
+
+#define __restore_dsp(tsk) \
+do { \
+ register u32 *__ts2 __asm__ ("r2") = \
+ (u32 *)&tsk->thread.dsp_status; \
+ __asm__ __volatile__ ( \
+ ".balign 4\n\t" \
+ "movs.l @r2+, a0\n\t" \
+ "movs.l @r2+, a1\n\t" \
+ "movs.l @r2+, a0g\n\t" \
+ "movs.l @r2+, a1g\n\t" \
+ "movs.l @r2+, m0\n\t" \
+ "movs.l @r2+, m1\n\t" \
+ "movs.l @r2+, x0\n\t" \
+ "movs.l @r2+, x1\n\t" \
+ "movs.l @r2+, y0\n\t" \
+ "movs.l @r2+, y1\n\t" \
+ "lds.l @r2+, dsr\n\t" \
+ "ldc.l @r2+, rs\n\t" \
+ "ldc.l @r2+, re\n\t" \
+ "ldc.l @r2+, mod\n\t" \
+ : : "r" (__ts2)); \
+} while (0)
+
+#define __save_dsp(tsk) \
+do { \
+ register u32 *__ts2 __asm__ ("r2") = \
+ (u32 *)&tsk->thread.dsp_status + 14; \
+ \
+ __asm__ __volatile__ ( \
+ ".balign 4\n\t" \
+ "stc.l mod, @-r2\n\t" \
+ "stc.l re, @-r2\n\t" \
+ "stc.l rs, @-r2\n\t" \
+ "sts.l dsr, @-r2\n\t" \
+ "movs.l y1, @-r2\n\t" \
+ "movs.l y0, @-r2\n\t" \
+ "movs.l x1, @-r2\n\t" \
+ "movs.l x0, @-r2\n\t" \
+ "movs.l m1, @-r2\n\t" \
+ "movs.l m0, @-r2\n\t" \
+ "movs.l a1g, @-r2\n\t" \
+ "movs.l a0g, @-r2\n\t" \
+ "movs.l a1, @-r2\n\t" \
+ "movs.l a0, @-r2\n\t" \
+ : : "r" (__ts2)); \
+} while (0)
+
+#else
+
+#define is_dsp_enabled(tsk) (0)
+#define __save_dsp(tsk) do { } while (0)
+#define __restore_dsp(tsk) do { } while (0)
+#endif
+
+struct task_struct *__switch_to(struct task_struct *prev,
+ struct task_struct *next);
+
+/*
+ * switch_to() should switch tasks to task nr n, first
+ */
+#define switch_to(prev, next, last) \
+do { \
+ register u32 *__ts1 __asm__ ("r1"); \
+ register u32 *__ts2 __asm__ ("r2"); \
+ register u32 *__ts4 __asm__ ("r4"); \
+ register u32 *__ts5 __asm__ ("r5"); \
+ register u32 *__ts6 __asm__ ("r6"); \
+ register u32 __ts7 __asm__ ("r7"); \
+ struct task_struct *__last; \
+ \
+ if (is_dsp_enabled(prev)) \
+ __save_dsp(prev); \
+ if (is_dsp_enabled(next)) \
+ __restore_dsp(next); \
+ \
+ __ts1 = (u32 *)&prev->thread.sp; \
+ __ts2 = (u32 *)&prev->thread.pc; \
+ __ts4 = (u32 *)prev; \
+ __ts5 = (u32 *)next; \
+ __ts6 = (u32 *)&next->thread.sp; \
+ __ts7 = next->thread.pc; \
+ \
+ __asm__ __volatile__ ( \
+ ".balign 4\n\t" \
+ "stc.l gbr, @-r15\n\t" \
+ "sts.l pr, @-r15\n\t" \
+ "mov.l r8, @-r15\n\t" \
+ "mov.l r9, @-r15\n\t" \
+ "mov.l r10, @-r15\n\t" \
+ "mov.l r11, @-r15\n\t" \
+ "mov.l r12, @-r15\n\t" \
+ "mov.l r13, @-r15\n\t" \
+ "mov.l r14, @-r15\n\t" \
+ "mov.l r15, @r1\t! save SP\n\t" \
+ "mov.l @r6, r15\t! change to new stack\n\t" \
+ "mova 1f, %0\n\t" \
+ "mov.l %0, @r2\t! save PC\n\t" \
+ "mov.l 2f, %0\n\t" \
+ "jmp @%0\t! call __switch_to\n\t" \
+ " lds r7, pr\t! with return to new PC\n\t" \
+ ".balign 4\n" \
+ "2:\n\t" \
+ ".long __switch_to\n" \
+ "1:\n\t" \
+ "mov.l @r15+, r14\n\t" \
+ "mov.l @r15+, r13\n\t" \
+ "mov.l @r15+, r12\n\t" \
+ "mov.l @r15+, r11\n\t" \
+ "mov.l @r15+, r10\n\t" \
+ "mov.l @r15+, r9\n\t" \
+ "mov.l @r15+, r8\n\t" \
+ "lds.l @r15+, pr\n\t" \
+ "ldc.l @r15+, gbr\n\t" \
+ : "=z" (__last) \
+ : "r" (__ts1), "r" (__ts2), "r" (__ts4), \
+ "r" (__ts5), "r" (__ts6), "r" (__ts7) \
+ : "r3", "t"); \
+ \
+ last = __last; \
+} while (0)
+
+#endif /* __ASM_SH_SWITCH_TO_32_H */